When the temperature continues to rise, the test piece has a small amount of vitreous, and only a small amount exists. The reason for this explanation is apparently that the crystal portion is melted into a glassy state because the temperature exceeds the melting temperature. The heated test piece body was observed with a microscope, and it was found that the structure was not very dense, and the edge of the quartz particle was broken. Continue heating to a test piece, from light red to red, the finely ground blended refractory silicon powder particles and the cement have obvious boundaries, forming a reaction edge, indicating that they play a role. The application of the inorganic silicon compound cemented refractory material is developed into a red hard and compact structure, which can clearly distinguish cristobalite, mullite and crystal in microscopic observation.
When the temperature continues to rise and heat up to the above, the clearer the mullite observed in the microscope, the easier it is to see, and the denser the better. High-temperature properties of silicon compound cemented refractories The high-temperature properties of silicon compound cemented refractories mainly include high-temperature strength, high-temperature strength, chilling heat and residual line deformation.
After the high temperature, the strength test piece is heated at different temperatures and then subjected to a compression test. The change characteristic is that the strength within a range is sharply increased, and the strength is continuously increased within a range, and the strength within the range is slightly decreased, and the strength is increased again. It is known from the microscope that there are quartz and sodium disilicate crystals in the cement stone, and it is clear that the quartz crystal state changes, and the volume becomes large and expands, so that the strength of the cemented refractory material is lowered. The strength of the water glass refractory material is again increased.
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